[PATCH] FROMLIST: arm64: dts: sc7180: Fix ps8640 power sequence for Homestar rev4
From: yangcong <hidden>
Date: 2021-11-15 02:50:53
Also in:
linux-arm-msm, lkml
Subsystem:
arm/qualcomm chromebook support, arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Linus Torvalds
When powering up the ps8640, we need to deassert PD right after we turn on the vdd33 regulator. Unfortunately, the vdd33 regulator takes some time (~4ms) to turn on. Add in the delay for the vdd33 regulator so that when the driver deasserts PD that the regulator has had time to ramp. Signed-off-by: yangcong <redacted> --- arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts b/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts
index fb27106bbb4a..0de0c97f5728 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar-r4.dts@@ -15,3 +15,7 @@ / { model = "Google Homestar (rev4+)"; compatible = "google,homestar", "qcom,sc7180"; }; + +&pp3300_brij_ps8640 { + regulator-enable-ramp-delay = <4000>; +};
--
2.25.1